Pharrell Williams has posted a picture of himself with Miley Cyrus and Tyler the Creator, suggesting the trio are working on music together

The former 'Hannah Montana' star is currently in the studio working on her fourth album with rapper-and-producer Pharrell Williams, and the N.E.R.D. star revealed they have also been joined by the controversial rapper.

Posting a picture of himself with the two stars, Pharrell tweeted: "In the lab..."

Miley has previously revealed Pharrell wanted to work with her after she was caught on camera smoking the psychedelic drug Salvia in December 2010.

The former Disney star previously said: "It was magic. Pharrell said, 'Don't be offended because this is how I talk, but [I thought], 'That b***h is actually living.'

"She's not sitting there with her Momager's chain on her door. I want to free that b***h. I want her out of her cage'."

Miley - who is engaged to 'Hunger Games' star Liam Hemsworth - said the pair had a magical time in the recording studio and Pharrell has since become like a brother to her.

Miley gushed: "I'd never worked like that before. I was talking to him like he was an older brother, and everything I said was going onto the track.

"I got in there with Pharrell, and it was magic. Oh, dude, I'm so happy."